1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c38e320f3d441ca443b388dea55954b20d51efbd9d3d6da8cdf6502ff01442. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16bac9aa-95d8-4f6f-a44b-da8beaf64451.json and https://artists.proofprofile.net/proofs/artist/16bac9aa-95d8-4f6f-a44b-da8beaf64451.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65f0c220cccd5958cf9fda1fd2b3b74233a68329eb062acad9ed033542db08b. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2026394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640f99e9e2585421f9ea29db7247d9f72320467959123db69eb2e3193294df05. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2081628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c02474c01b538e46464d9460962b426d5d8f5e5ff79ec45c05bb38ad3670f23. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2081629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404cd4c1b4db2929164ddb5a02ec579d7d307cec4ac3e2b3744a56139fceca25. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CYA112000704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b209df5dd0f93153bbe369853ce5892f51862ea34455e7ef401a61a14fd2f7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CYA112000864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f5e994747e384f3c34072fb3d1ce7e536a7e70830bf1896626ff296b966aa0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2301152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149c0f4cb6e43f5bfc437ce53b03d6c6fa493a985d6ecd75970c5c035f85bfe3. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2499336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac34540cdf40970d9bb6f50628e2094544629bb15234158c57dc5fe0c08c2ec. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CHC652400214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e6035bfac7e4945053545366d850846a493c56c4c0018f19366c30fb584ef6. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2502041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f66ced2cc4c60990fb30c7a5daf736214db34059b6df64dc8f07ddd7cd2e567. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US83Z2502042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe4c64576da85ac09fd6d8a41c8a585ebc1770b23f8de9311eb68a149a60d21. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ8D2100771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f820939e997337c2fd7760982df092620f5e702dfa3d78a4c371d8c0451224. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLV62016575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ee701886f7ffb7c886803a0231107cbfc66526b89fe1bc5abeaea2bd0c09a4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2059897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89eb261564035afdf65b3dec47de8cf7f8e291f6fcc8a7449bb8dd8f489aa71. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2059898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac34540cdf40970d9bb6f50628e2094544629bb15234158c57dc5fe0c08c2ec. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CHC652400214.